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Just want to upgrade my hydraulic flat tappet. Hydraulic rollers don't RPM, so I thought a solid roller would make a bit more horsepower.

That would normally be true. I assume you are talking about a complete cam and kit including springs and retainers.
The big advantage with a roller cam is valve opening and closing rates. Even a cam with the same listed duration @ .050 might show an improvement in Hp as it give the motor more time to breath. You don't have a ton of compression and you have a heavy car so don't go over board.
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